The Mercedes team bosses have held up their hands after Nico Rosberg was gift the Monaco GP victory at Lewis Hamilton's expense.
Hamilton was cruising to his second victory on the streets of Monte Carlo as he had a 24s lead over team-mate Rosberg with 14 laps to go while Sebastian Vettel in the Ferrai was not too far behind in third place.
However, Max Verstappen tagged the back of Romain Grosjean and put his STR in the wall and that changed the outcome of the result as Merc decided to pit Hamilton as a precautionary.
Rosberg and Vettel did not pit for new tyres and they ended up ahead of Hamilton on the track and that's the way the race finished with Hamilton having to settle for third place.
Mercedes motorsport boss Tot Wolff admitted afterwards that they got it wrong.
"Yes we lost Lewis the grand prix. We thought the gap was different than it was. Complete misjudgment," he said.
"We screwed it up for him. All we can do is apologise and apologise and apologise."
He added: "I'm sorry for Lewis that we made the mistake and I'm sorry for Lewis. It should have been a perfect 1-2 today.
"We made a decision and it was the wrong decision. We need to analyse it and to apologise to Lewis"